EP0160235B1 - Supervision device for the tripping circuit of an electrical power circuit breaker, and supervision method - Google Patents

Supervision device for the tripping circuit of an electrical power circuit breaker, and supervision method Download PDF

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Publication number
EP0160235B1
EP0160235B1 EP85104197A EP85104197A EP0160235B1 EP 0160235 B1 EP0160235 B1 EP 0160235B1 EP 85104197 A EP85104197 A EP 85104197A EP 85104197 A EP85104197 A EP 85104197A EP 0160235 B1 EP0160235 B1 EP 0160235B1
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Prior art keywords
oscillator
circuit
relay
alarm
diode
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EP85104197A
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German (de)
French (fr)
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EP0160235A1 (en
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Gerhard Wacha
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BBC Brown Boveri AG Switzerland
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BBC Brown Boveri AG Switzerland
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned

Definitions

  • the invention is based on a monitoring device for the tripping circuit of an electrical circuit breaker according to the preamble of patent claim 1.
  • the invention relates to a prior art of monitoring devices for the tripping circuit of an electrical switch, as is known from US Pat. No. 3,641,552.
  • a first oscillator serves as a detector for monitoring the passage of current through the trigger circuit, a door and / or window monitoring device, an ohmic resistance of the trigger circuit determining the frequency for the latter.
  • This 1st oscillator is followed by a 2nd oscillator designed for a lower frequency than the frequency of the 1st oscillator, which does not oscillate as long as the frequency of the 1st oscillator is greater than that of the 2nd oscillator. If an error occurs in the trip circuit (e.g.
  • the frequency of the 1st oscillator falls below the fixed frequency of the 2nd oscillator (or the 1st oscillator stops oscillating), which means that a transistor of the 2nd oscillator with a Delay time, which corresponds to the frequency difference of the two oscillators, begins to conduct and an alarm device switches on.
  • the known monitoring circuit is connected directly to the oscillators, so that its contacts cannot be connected to a higher voltage.
  • the current consumption of the monitoring device is not constant, but depends on the switched-on state of the second oscillator.
  • trip circuit monitoring relay type VIR 1 a trip circuit monitoring relay is shown and described, which has a monitoring element with two windings, one winding via a limiting resistor with the connecting terminals of a protective relay in the supply line to a circuit breaker and the other winding also via a limiting resistor with a main -and auxiliary contact of the circuit breaker are connected.
  • An alarm relay can be switched on / off via switching contacts of the trip circuit monitoring relay, the switching contacts of which are arranged in the circuit of an alarm device with a separate alarm voltage.
  • the tripping circuit monitoring relay speaks in this monitoring device to a short circuit in the opening coil of the circuit breaker or to a large increase in the resistance of the opening coil z. B. not due to corrosion.
  • the invention solves the problem of monitoring the tripping circuit of a circuit breaker for an interruption in the supply lines and for a short circuit in the tripping coil, without the need for a separate power supply for the monitoring device.
  • the tripping circuit should be connectable to different supply voltages.
  • An advantage of the invention is that a higher security of fault detection for circuit breaker trip circuits can be guaranteed without additional costs.
  • the trip circuit of the circuit breaker can also be monitored for failure of the trip voltage and for faulty switching operations.
  • the monitoring device is suitable for circuit breakers which are connected to the tripping voltage via protective relay contacts or via switching thyristors which can be cleared without problems, which is not readily possible when using a tripping circuit monitoring relay with holding current. It can also control circuits with parallel connection of circuit breaker tripping coils and control relays z. B. be monitored for the excitation of switch reserve protection devices. There is also the option of monitoring control circuits in which a main trip relay for many contacts and signals (master trip relay) is monitored instead of the circuit breaker opening coil.
  • Another advantage is that no trip circuit monitoring relay with mechanical contacts is required.
  • the trigger voltage of the system is used as the alarm voltage to supply the monitoring device with power.
  • the current consumption of the monitoring device is constant, so that it can be adapted to different trigger voltages by means of series resistors. If this voltage fails, there is an instantaneous alarm.
  • DE-OS 3 037 273 an electronic trip circuit monitoring device with an optocoupler diode between three measurement signal input stages and a signaling stage for visual and / or acoustic error reporting is known.
  • This monitoring device works on the principle of current monitoring, with the voltage drop at two power diodes connected in series in the circuit of the circuit breaker being detected.
  • the measuring current of approx. 20 mA required for function monitoring in the trip circuit is generated by wiring the protective trip contacts and circuit breaker auxiliary contacts with glazed wire resistors.
  • the signaling level responds when the measuring current is in one of the measurement signal input levels falls below approx. 12 mA.
  • a zener diode is provided in each input stage in parallel with the two power diodes and is rated for short-time currents of 10 A. Disadvantages here are the arrangement of power diodes that are relatively at risk of failure and auxiliary circuit breaker contacts in the tripping circuit and the parallel connection of glazed wire resistors.
  • Fig. 1 denotes a positive voltage terminal for a tripping voltage of 220 V and 2 denotes a negative voltage terminal for an earth wire voltage of 0 V.
  • the positive voltage terminal 1 is connected to a terminal 3 of a protective relay contact 4 'of a protective relay (4, 4' ) electrically connected to a protective relay measuring element 4.
  • the second connection terminal of the protective relay contact 4 ' is designated by 5. It is electrically connected via a closed circuit breaker control contact 6 'of a circuit breaker and via its opening coil 6 to the negative connection terminal 2.
  • 6 denotes a circuit breaker auxiliary contact of the circuit breaker which is open when the circuit breaker cut-off contact 6 'is closed and which is closed when 6' is open.
  • the second connection terminal of the circuit breaker auxiliary contact 6 is electrically connected to the cathode of an avalanche diode D2 with a high breakdown voltage.
  • the anode of this diode D2 is connected to the connection terminal 5 via an avalanche diode D1 with the same polarity and to the cathode via a resistor R.
  • the anode of the diode D3 is connected to a resistance input 11 of an oscillator 12.
  • the diode D3 serves to block the polarity-sensitive stage of the input transistor of the oscillator 12
  • the anode of the diode D4 is connected to the negative voltage terminal 2 and the cathode of the diode D5 to a voltage line 10.
  • the oscillator 12, a delay element 14 and a voltage stabilizer 16 are supplied with a positive supply voltage, specifically via a bistable Toggle element or a Schmitt trigger 17.
  • the Schmitt Tri gger 17 is electrically connected to the connection terminal 3 of the protective relay contact 4 'via a feed line 20 and a series resistor RV, it is therefore part of the series resistor of the voltage stabilizer 16.
  • a damping resistor 8 with a damping capacitor 9 is connected in series between the positive voltage terminal 1 and the connecting terminal 5 of the protective relay contact 4 'in order to dampen voltage peaks when the protective relay contact 4' is opened.
  • This quenching circuit has no adverse effects on the monitoring function of the oscillator for the passage of the monitored path of the circuit.
  • the oscillator 12 is on the output side via a signal line 13 or via signal lines 13 ', 13 "and 13"', cf. Fig. 2, connected to the signal input of the delay element 14 or to signal inputs of a timing element designed as a differential amplifier.
  • the delay element is designed for a delay of 500 ms. It is connected on the output side via a signal line 15 to the control input of an emitter-coupled Schmitt trigger.
  • the Schmitt trigger 17 has an alarm relay coil 18 of an alarm relay (18, 18 ').
  • An alarm relay contact 18 'of the alarm relay is arranged in the power supply line of an alarm device 19.
  • the alarm device 19 is fed by an alarm voltage via a positive voltage terminal 21; it can also be fed directly from the trigger voltage.
  • a polarized electrolytic capacitor C1 is connected in parallel with the Schmitt trigger 17 in order to damp harmonics.
  • the voltage stabilizer 16 has a smoothing capacitor, parallel to it two Zener diodes connected in series with a resistor and a base-controlled power transistor; it keeps the supply voltage for the oscillator 12 and the delay element 14 constant at approximately 12 V.
  • the oscillator 12 brings the circuit breaker opening coil 6 via the diode D3, the resistor R, the diode D1, the connecting terminal 5 and the closed circuit breaker control contact 6 'or, when the circuit breaker auxiliary contact 6 "is closed, via this and the diode D2, the resistor R and the diode D3 for oscillation.
  • the oscillation is monitored. If the oscillation fails, a delayed alarm is triggered via the delay element 14.
  • the differential amplifier of the delay element 14 generates a breakover voltage on the output side, which remains below 200 mV in the fault-free case and in the event of a fault can rise to about 12 V within 500 ms and then trigger the Schmitt trigger, as a result of which the alarm relay 18, 18 'responds and actuates the alarm device 19 via the alarm relay contact 18'.
  • the alarm can be acoustically and / or optically in the usual or be given as desired.
  • an alarm relay contact 18 ' a plurality of contacts which are actuated at the same time can also be provided for different functions.
  • the circuits indicated in FIG. 2 for the oscillator 12, the delay element 14, the voltage stabilizer 16 and the Schmitt trigger 17 other known circuits of such devices or devices can also be used. It is important that the trigger circuit to be monitored is subjected to an oscillator oscillation, that a detuning of the oscillator is monitored with subsequent absence of the oscillator oscillation and that an alarm is triggered depending on this with a predefinable delay.

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  • Keying Circuit Devices (AREA)
  • Emergency Protection Circuit Devices (AREA)

Description

Bei der Erfindung wird ausgegangen von einer Ueberwachungseinrichtung für den Auslösekreis eines elektrischen Leistungsschalters nach dem Oberbegriff des Patentanspruchs 1.The invention is based on a monitoring device for the tripping circuit of an electrical circuit breaker according to the preamble of patent claim 1.

Mit dem Oberbegriff nimmt die Erfindung auf einen Stand der Technik von Ueberwachungseinrichtungen für den Auslösekreis eines elektrischen Schalters Bezug, wie er aus der US-A-3 641 552 bekannt ist. Dort dient ein 1. Oszillator als Detektor zur Ueberwachung des Stromdurchganges durch den Auslösekreis, einer Tür- und/oder Fensterüberwachungseinrichtung, wobei ein ohmscher Widerstand des Auslösekreises für diesen frequenzbestimmend ist. Diesem 1. Oszillator ist ein für eine kleinere Frequenz als die Frequenz des 1. Oszillators ausgelegter 2. Oszillator nachgeordnet, der solange nicht schwingt, als die Frequenz des 1. Oszillators grösser als die des 2. Oszillators ist. Bei Auftreten eines Fehlers im Auslösekreis (z. B. Kurzschluss oder Unterbrechung) unterschreitet die Frequenz des 1. Oszillators die fixe Frequenz des 2. Oszillators (oder der 1. Oszillator hört auf zu schwingen), wodurch ein Transistor des 2. Oszillators mit einer Verzögerungszeit, die der Frequenzdifferenz der beiden Oszillatoren entspricht, zu leiten beginnt und eine Alarmeinrichtung einschaltet. Der bekannte Ueberwachungskreis ist direkt an die Oszillatoren angeschlossen, so dass dessen Kontakte nicht an eine höhere Spannung angeschlossen werden können. Der Stromverbrauch der Ueberwachungseinrichtung ist nicht konstant, sondern vom Einschaltzustand des 2. Oszillators abhängig.With the preamble, the invention relates to a prior art of monitoring devices for the tripping circuit of an electrical switch, as is known from US Pat. No. 3,641,552. There, a first oscillator serves as a detector for monitoring the passage of current through the trigger circuit, a door and / or window monitoring device, an ohmic resistance of the trigger circuit determining the frequency for the latter. This 1st oscillator is followed by a 2nd oscillator designed for a lower frequency than the frequency of the 1st oscillator, which does not oscillate as long as the frequency of the 1st oscillator is greater than that of the 2nd oscillator. If an error occurs in the trip circuit (e.g. short circuit or interruption), the frequency of the 1st oscillator falls below the fixed frequency of the 2nd oscillator (or the 1st oscillator stops oscillating), which means that a transistor of the 2nd oscillator with a Delay time, which corresponds to the frequency difference of the two oscillators, begins to conduct and an alarm device switches on. The known monitoring circuit is connected directly to the oscillators, so that its contacts cannot be connected to a higher voltage. The current consumption of the monitoring device is not constant, but depends on the switched-on state of the second oscillator.

Aus der US-A-3 418 914 ist eine Kohlenmonoxid-Ueberwachungseinrichtung für die Fahrerkabine eines Autos bekannt, bei der eine Alarm- und Ventilationseinrichtung in Abhängigkeit vom Kippzustand eines bistabilen Kippgliedes in Form eines emittergekoppelten Schmitt-Triggers ein-/ ausschaltbar ist.From US-A-3 418 914 a carbon monoxide monitoring device for the driver's cabin of a car is known, in which an alarm and ventilation device can be switched on / off in the form of an emitter-coupled Schmitt trigger depending on the tilting state of a bistable flip-flop.

In dem Prospekt der Schweizer Firma Brown, Boveri + Cie., CH-ES 64-22.1 D/E/F, Classification No. 071401, Auslösekreisüberwachungsrelais Typ VIR 1, ist ein Auslösekreisüberwachungsrelais dargestellt und beschrieben, das ein Ueberwachungselement mit zwei Wicklungen aufweist, wobei eine Wicklung über einen Begrenzungswiderstand mit den Anschlussklemmen eines Schutzrelais in der Zuleitung zu einem Leistungsschalter und die andere Wicklung ebenfalls über einen Begrenzungswiderstand mit einem Haupt-und Hilfskontakt des Leistungsschalters verbunden sind. Ueber Schaltkontakte des Auslösekreisüberwachungsrelais ist ein Alarmrelais ein-/ ausschaltbar, dessen Schaltkontakte im Stromkreis einer Alarmeinrichtung mit separater Alarmspannung angeordnet sind. Das Auslösekreisüberwachungsrelais spricht bei dieser Ueberwachungseinrichtung auf einen Kurzschluss der Ausschaltspule des Leistungsschalters oder auf eine starke Vergrösserung des Widerstandes der Ausschaltspule z. B. durch Korrosion nicht an.In the prospectus of the Swiss company Brown, Boveri + Cie., CH-ES 64-22.1 D / E / F, Classification No. 071401, trip circuit monitoring relay type VIR 1, a trip circuit monitoring relay is shown and described, which has a monitoring element with two windings, one winding via a limiting resistor with the connecting terminals of a protective relay in the supply line to a circuit breaker and the other winding also via a limiting resistor with a main -and auxiliary contact of the circuit breaker are connected. An alarm relay can be switched on / off via switching contacts of the trip circuit monitoring relay, the switching contacts of which are arranged in the circuit of an alarm device with a separate alarm voltage. The tripping circuit monitoring relay speaks in this monitoring device to a short circuit in the opening coil of the circuit breaker or to a large increase in the resistance of the opening coil z. B. not due to corrosion.

Die Erfindung, wie sie im Patentanspruch 1 definiert ist, löst die Aufgabe, den Auslösekreis eines Leistungsschalters auf Unterbrechung der Zuleitungen und auf Kurzschluss der Auslösespule zu überwachen, ohne dass eine eigene Stromversorgung für die Ueberwachungseinrichtung erforderlich ist. Dabei soll der Auslösekreis an unterschiedliche Speisespannungen anschliessbar sein.The invention, as defined in claim 1, solves the problem of monitoring the tripping circuit of a circuit breaker for an interruption in the supply lines and for a short circuit in the tripping coil, without the need for a separate power supply for the monitoring device. The tripping circuit should be connectable to different supply voltages.

Ein Vorteil der Erfindung besteht darin, dass ohne zusätzliche Kosten eine höhere Sicherheit der Fehlererfassung für Leistungsschalter-Auslösekreise gewährleistet werden kann. Der Auslösekreis des Leistungsschalters kann auch auf Ausfall der Auslösespannung und auf fehlerhaften Schaltungsablauf überwacht werden.An advantage of the invention is that a higher security of fault detection for circuit breaker trip circuits can be guaranteed without additional costs. The trip circuit of the circuit breaker can also be monitored for failure of the trip voltage and for faulty switching operations.

Die Ueberwachungseinrichtung eignet sich für Leistungsschalter, die über Schutzrelaiskontakte an die Auslösespannung gelegt werden oder über Schaltthyristoren, die ohne Probleme löschen können, was bei Verwendung eines Auslösekreisüberwachungsrelais mit Haltestrom nicht ohne weiteres möglich ist. Es können auch Steuerkreise mit Parallelschaltung von Leistungsschalter-Auslösespulen und Steuerrelais z. B. zur Anregung von Schalter-Reserveschutzeinrichtungen überwacht werden. Ferner besteht die Möglichkeit zur Ueberwachung von Steuerkreisen, in denen statt der Leistungsschalter-Ausschaltspule ein Hauptauslöserelais für viele Kontakte und Signale (master trip relay) überwacht wird.The monitoring device is suitable for circuit breakers which are connected to the tripping voltage via protective relay contacts or via switching thyristors which can be cleared without problems, which is not readily possible when using a tripping circuit monitoring relay with holding current. It can also control circuits with parallel connection of circuit breaker tripping coils and control relays z. B. be monitored for the excitation of switch reserve protection devices. There is also the option of monitoring control circuits in which a main trip relay for many contacts and signals (master trip relay) is monitored instead of the circuit breaker opening coil.

Ein weiterer Vorteil besteht darin, dass kein Auslösekreisüberwachungsrelais mit mechanischen Kontakten erforderlich ist.Another advantage is that no trip circuit monitoring relay with mechanical contacts is required.

Zur Stromversorgung der Ueberwachungseinrichtung wird als Alarmspannung die Auslösespannung der Anlage verwendet. Die Stromaufnahme der Ueberwachungseinrichtung ist konstant, so dass die Anpassung an verschiedene Auslösespannungen mittels Vorwiderständen möglich ist. Bei Ausfall dieser Spannung erfolgt eine unverzögerte Alarmgebung.The trigger voltage of the system is used as the alarm voltage to supply the monitoring device with power. The current consumption of the monitoring device is constant, so that it can be adapted to different trigger voltages by means of series resistors. If this voltage fails, there is an instantaneous alarm.

Begrenzungswiderstände in den Zuleitungen der Wicklungen des Ueberwachungselementes des Auslösekreisüberwachungsrelais entfallen.Limiting resistances in the leads of the windings of the monitoring element of the tripping circuit monitoring relay are eliminated.

Zum einschlägigen Stand der Technik wird zusätzlich auf die DE-OS 3 037 273 verwiesen, aus der ein elektronisches Auslösekreis-Ueberwachungsgerät mit einer Optokopplerdiode zwischen drei Messignal-Eingangsstufen und einer Meldestufe zur visuellen und/oder akustischen Fehlersofortmeldung bekannt ist. Dieses Ueberwachungsgerät arbeitet nach dem Prinzip der Stromüberwachung, wobei der Spannungsabfall an zwei in Reihe geschalteten Leistungsdioden im Stromkreis des Leistungsschalters detektiert wird. Der für die Funktionsüberwachung im Auslösekreis notwendige Messstrom von ca. 20 mA wird durch Beschaltung der Schutzauslösekontakte sowie von Leistungsschalter-Hilfskontakten mit glasierten Drahtwiderständen erzeugt. Die Meldestufe spricht an, wenn der Messstrom in einer der Messignal-Eingangsstufen ca. 12 mA unterschreitet. Zum Schutz vor Ueberspannungen im Fehlerfalle eines Hochohmigwerdens einer Leistungsdiode ist in jeder Eingangsstufe parallel zu den zwei Leistungsdioden eine Zenerdiode vorgesehen, die für Kurzzeitströme von 10 A bemessen ist. Nachteilig dabei ist die Anordnung von vergleichsweise stark ausfällgefährdeten Leistungsdioden und von Leistungsschalter-Hilfskontakten im Auslösekreis sowie das Parallelschalten von glasierten Drahtwiderständen.Regarding the relevant prior art, reference is also made to DE-OS 3 037 273, from which an electronic trip circuit monitoring device with an optocoupler diode between three measurement signal input stages and a signaling stage for visual and / or acoustic error reporting is known. This monitoring device works on the principle of current monitoring, with the voltage drop at two power diodes connected in series in the circuit of the circuit breaker being detected. The measuring current of approx. 20 mA required for function monitoring in the trip circuit is generated by wiring the protective trip contacts and circuit breaker auxiliary contacts with glazed wire resistors. The signaling level responds when the measuring current is in one of the measurement signal input levels falls below approx. 12 mA. To protect against overvoltages in the event of a high-resistance power diode becoming faulty, a zener diode is provided in each input stage in parallel with the two power diodes and is rated for short-time currents of 10 A. Disadvantages here are the arrangement of power diodes that are relatively at risk of failure and auxiliary circuit breaker contacts in the tripping circuit and the parallel connection of glazed wire resistors.

Die Erfindung wird nachstehend anhand eines Ausführungsbeispiels erläutert. Es zeigen :

  • Fig. 1 ein Prinzipschaltbild der Ueberwachungseinrichtung und
  • Fig. 2 eine Schaltungsanordnung der in Fig. 1 durch Blockschaltbilder dargestellten Geräte bzw. Vorrichtungen.
The invention is explained below using an exemplary embodiment. Show it :
  • Fig. 1 is a schematic diagram of the monitoring device and
  • Fig. 2 shows a circuit arrangement of the devices or devices shown in Fig. 1 by block diagrams.

In Fig. 1 ist mit 1 eine positive Spannungsklemme für eine Auslösespannung von 220 V bezeichnet und mit 2 eine negative Spannungsklemme für eine Erdleiterspannung von 0 V. Die positive Spannungsklemme 1 ist mit einer Anschlussklemme 3 eines Schutzrelaiskontaktes 4' eines Schutzrelais (4, 4') mit einem Schutzrelaismesselement 4 elektrisch verbunden. Die zweite Anschlussklemme des Schutzrelaiskontaktes 4' ist mit 5 bezeichnet. Sie ist über einen geschlossenen Leistungsschalter-Absteuerkontakt 6' eines Leistungsschalters und über dessen Ausschaltspule 6 mit der negativen Anschlussklemme 2 elektrisch verbunden. Mit 6" ist ein Leistungsschalter-Hilfskontakt des Leistungsschalters bezeichnet, der geöffnet ist, wenn der Leistungsschalter-Absteuerkontakt 6' geschlossen ist und der geschlossen ist, wenn 6' geöffnet ist.In Fig. 1, 1 denotes a positive voltage terminal for a tripping voltage of 220 V and 2 denotes a negative voltage terminal for an earth wire voltage of 0 V. The positive voltage terminal 1 is connected to a terminal 3 of a protective relay contact 4 'of a protective relay (4, 4' ) electrically connected to a protective relay measuring element 4. The second connection terminal of the protective relay contact 4 'is designated by 5. It is electrically connected via a closed circuit breaker control contact 6 'of a circuit breaker and via its opening coil 6 to the negative connection terminal 2. 6 "denotes a circuit breaker auxiliary contact of the circuit breaker which is open when the circuit breaker cut-off contact 6 'is closed and which is closed when 6' is open.

Die zweite Anschlussklemme des Leistungsschalter-Hilfskontaktes 6" ist mit der Kathode einer Avalanche-Diode D2 mit hoher Durchbruchspannung elektrisch verbunden. Die Anode dieser Diode D2 ist über eine gleich gepolte Avalanche-Diode D1 mit der Anschlussklemme 5 sowie über einen Widerstand R mit der Kathode einer Diode D3, mit der Kathode einer Diode D4 und mit der Anode einer weiteren Diode D5 elektrisch verbunden. Die Anode der Diode D3 ist an einen Widerstandseingang 11 eines Oszillators 12 angeschlossen. Die Diode D3 dient zum Abblocken der polaritätsempfindlichen Stufe des Eingangstransistors des Oszillators 12. Die Anode der Diode D4 ist an die negative Spannungsklemme 2 angeschlossen und die Kathode der Diode D5 an eine Spannungsleitung 10. Ueber diese Spannungsleitung 10 werden der Oszillator 12, ein Verzögerungsglied 14 und ein Spannungskonstanthalter 16 mit positiver Speisespannung versorgt, und zwar über ein bistabiles Kippglied bzw. einen Schmitt-Trigger 17. Der Schmitt-Trigger 17 ist über eine Speiseleitung 20 und einen Vorwiderstand RV mit der Anschlussklemme 3 des Schutzrelaiskontaktes 4' elektrisch verbunden, er ist damit Teil des Vorwiderstandes des Spannungskonstanthalters 16.The second connection terminal of the circuit breaker auxiliary contact 6 "is electrically connected to the cathode of an avalanche diode D2 with a high breakdown voltage. The anode of this diode D2 is connected to the connection terminal 5 via an avalanche diode D1 with the same polarity and to the cathode via a resistor R. a diode D3, electrically connected to the cathode of a diode D4 and to the anode of a further diode D5 The anode of the diode D3 is connected to a resistance input 11 of an oscillator 12. The diode D3 serves to block the polarity-sensitive stage of the input transistor of the oscillator 12 The anode of the diode D4 is connected to the negative voltage terminal 2 and the cathode of the diode D5 to a voltage line 10. Via this voltage line 10, the oscillator 12, a delay element 14 and a voltage stabilizer 16 are supplied with a positive supply voltage, specifically via a bistable Toggle element or a Schmitt trigger 17. The Schmitt Tri gger 17 is electrically connected to the connection terminal 3 of the protective relay contact 4 'via a feed line 20 and a series resistor RV, it is therefore part of the series resistor of the voltage stabilizer 16.

Zwischen der positiven Spannungsklemme 1 und der Anschlussklemme 5 des Schutzrelaiskontaktes 4' ist ein Dämpfungswiderstand 8 mit einem Dämpfungskondensator 9 in Reihe geschaltet, um Spannungsspitzen beim Oeffnen des Schutzrelaiskontaktes 4' zu dämpfen. Dieser Löschkreis hat keine nachteilige Auswirkungen auf die Ueberwachungsfunktion des Oszillators auf Durchgang der überwachten Strecke des Kreises.A damping resistor 8 with a damping capacitor 9 is connected in series between the positive voltage terminal 1 and the connecting terminal 5 of the protective relay contact 4 'in order to dampen voltage peaks when the protective relay contact 4' is opened. This quenching circuit has no adverse effects on the monitoring function of the oscillator for the passage of the monitored path of the circuit.

Der Oszillator 12 ist ausgangsseitig über eine Signalleitung 13 bzw. über Signalleitungen 13', 13" und 13"', vgl. Fig. 2, mit dem Signaleingang des Verzögerungsgliedes 14 bzw. mit Signaleingängen eines als Differenzverstärker ausgebildeten Zeitgliedes verbunden. Das Verzögerungsglied ist für eine Verzögerung von 500 ms ausgelegt. Es ist ausgangsseitig über eine Signalleitung 15 mit dem Steuereingang eines emittergekoppelten Schmitt-Triggers verbunden.The oscillator 12 is on the output side via a signal line 13 or via signal lines 13 ', 13 "and 13"', cf. Fig. 2, connected to the signal input of the delay element 14 or to signal inputs of a timing element designed as a differential amplifier. The delay element is designed for a delay of 500 ms. It is connected on the output side via a signal line 15 to the control input of an emitter-coupled Schmitt trigger.

Der Schmitt-Trigger 17 weist anstelle des sonst üblichen Kollektorwiderstandes des ausgangsseitigen Transistors eine Alarmrelais-Spule 18 eines Alarmrelais (18, 18') auf. Ein Alarmrelais-Kontakt 18' des Alarmrelais ist in der Stromzuleitung einer Alarmeinrichtung 19 angeordnet. Die Alarmeinrichtung 19 ist über eine positive Spannungsklemme 21 von einer Alarmspannung gespeist; sie kann auch direkt von der Auslösespannung gespeist werden.Instead of the otherwise common collector resistance of the transistor on the output side, the Schmitt trigger 17 has an alarm relay coil 18 of an alarm relay (18, 18 '). An alarm relay contact 18 'of the alarm relay is arranged in the power supply line of an alarm device 19. The alarm device 19 is fed by an alarm voltage via a positive voltage terminal 21; it can also be fed directly from the trigger voltage.

Anstelle eines einzigen Vorwiderstandes können mehrere Vorwiderstände RV1-RV5, siehe Fig. 2, mit mehreren Spannungsklemmen zum Anschluss kleinerer Auslösespannungen von 125 V oder 110 V oder 60 V oder 48 V vorgesehen sein.Instead of a single series resistor, several series resistors RV1-RV5, see FIG. 2, with several voltage terminals for connecting smaller trigger voltages of 125 V or 110 V or 60 V or 48 V can be provided.

Zur Dämpfung von Oberschwingungen ist parallel zum Schmitt-Trigger 17 ein polarisierter Elektrolytkondensator C1 geschaltet.A polarized electrolytic capacitor C1 is connected in parallel with the Schmitt trigger 17 in order to damp harmonics.

Der Spannungskonstanthalter 16 weist einen Glättungskondensator, parallel dazu zwei mit einem Widerstand in Reihe geschaltete Zenerdioden und einen basisgesteuerten Leistungstransistor auf ; er hält die Speisespannung für den Oszillator 12 und das Verzögerungsglied 14 auf ca. 12 V konstant.The voltage stabilizer 16 has a smoothing capacitor, parallel to it two Zener diodes connected in series with a resistor and a base-controlled power transistor; it keeps the supply voltage for the oscillator 12 and the delay element 14 constant at approximately 12 V.

Der Oszillator 12 bringt die Leistungsschalter-Ausschaltspule 6 über die Diode D3, den Widerstand R, die Diode D1, die Anschlussklemme 5 und den geschlossenen Leistungsschalter-Absteuerkontakt 6' oder, bei geschlossenem Leistungsschalter-Hilfskontakt 6", über diesen und die Diode D2, den Widerstand R und die Diode D3 zum Schwingen. Die Schwingung wird überwacht. Bei Ausbleiben der Schwingung wird über das Verzögerungsglied 14 ein verzögerter Alarm ausgelöst. Der Differenzverstärker des Verzögerungsgliedes 14 erzeugt ausgangsseitig eine Kippspannung, die im störungsfreien Fall unterhalb 200 mV bleibt und im Störfall innerhalb von 500 ms auf etwa 12 V ansteigen kann und dann den Schmitt-Trigger triggert, wodurch das Alarmrelais 18, 18' anspricht und über den Alarmrelais-Kontakt 18' die Alarmeinrichtung 19 betätigt. Der Alarm kann akustisch und/oder optisch in üblicher bzw. gewünschter Weise gegeben werden.The oscillator 12 brings the circuit breaker opening coil 6 via the diode D3, the resistor R, the diode D1, the connecting terminal 5 and the closed circuit breaker control contact 6 'or, when the circuit breaker auxiliary contact 6 "is closed, via this and the diode D2, the resistor R and the diode D3 for oscillation. The oscillation is monitored. If the oscillation fails, a delayed alarm is triggered via the delay element 14. The differential amplifier of the delay element 14 generates a breakover voltage on the output side, which remains below 200 mV in the fault-free case and in the event of a fault can rise to about 12 V within 500 ms and then trigger the Schmitt trigger, as a result of which the alarm relay 18, 18 'responds and actuates the alarm device 19 via the alarm relay contact 18'. The alarm can be acoustically and / or optically in the usual or be given as desired.

Statt eines Alarmrelais-Kontaktes 18' können auch mehrere gleichzeitig betätigte Kontakte für unterschiedliche Funktionen vorgesehen sein. Anstelle der in Fig. 2 angegegebenen Schaltungen für den Oszillator 12, das Verzögerungsglied 14, den Spannungskonstanthalter 16 und den Schmitt-Trigger 17 können auch andere bekannte Schaltungen solcher Geräte bzw. Einrichtungen verwendet werden. Wichtig ist, dass der zu überwachende Auslösekreis mit einer Oszillatorschwingung beaufschlagt wird, dass eine Verstimmung des Oszillators mit nachfolgendem Ausbleiben der Oszillatorschwingung überwacht wird und dass in Abhängigkeit davon mit einer vorgebbaren Verzögerung ein Alarm ausgelöst wird.Instead of an alarm relay contact 18 ', a plurality of contacts which are actuated at the same time can also be provided for different functions. Instead of the circuits indicated in FIG. 2 for the oscillator 12, the delay element 14, the voltage stabilizer 16 and the Schmitt trigger 17, other known circuits of such devices or devices can also be used. It is important that the trigger circuit to be monitored is subjected to an oscillator oscillation, that a detuning of the oscillator is monitored with subsequent absence of the oscillator oscillation and that an alarm is triggered depending on this with a predefinable delay.

Claims (4)

1. Monitoring device for the tripping circuit (6, 6', 6") of an electric circuit-breaker
a) with an oscillator (12) as detector for the monitoring of the current continuity through the tripping circuit, which detector generates an alarm signal in dependence on a fault state,
b) an ohmic and/or inductive resistor (6) of the tripping circuit to be monitored being frequency- determining resistance of the oscillator (12),
c) with a delay element (14) with predeterminable time constant, which is arranged downstream of the oscillator (12), and
d) with an alarm device (19), which can be switched on/off in dependence on the output signal of the delay element (14) and indicates the fault state in dependence on the alarm signal, characterized in that
e) the output signal of the delay element (14) is fed through the input of an emitter-coupled Schmitt trigger,
f) an alarm relay coil (18) of an alarm relay (18, 18') is connected as collector resistance of the output-side transistor of the Schmitt trigger (17)
g) the current supply of the oscillator (12) is in effective connection via the Schmitt trigger (17) with the input-side connection terminal (3) of a protective relay contact (4') of a protective relay (4, 4').
2. Monitoring device according to Claim 1, characterized in that
a) the oscillator (12) is in effective connection via at least one protective device (D1-D5, R) with the ohmic and/or inductive resistor (6) of the tripping circuit to be monitored, which protective device at least ensures that switching overvoltages occurring do not reach the input of the oscillator (12),
b) the protective device has a series circuit of a first and/or second avalanche diode (D1, D2) with a resistor (R),
c) which is in effective connection with the resistance input (11) of the oscillator (12), and
d) the resistance input of the oscillator is, furthermore, in effective connection with the cathode of a diode (D4), which is electrically connected on the anode side to a negative voltage terminal (2) of the oscillator (12), and
e) is in effective connection with the anode of a further diode (D5), which is electrically connected on the cathode side to a voltage line (10) for the current supply of the oscillator (12).
3. Monitoring device according to Claim 2, characterized in that
a) the tripping circuit (6, 6', 6") for the circuit-breaker has a relay,
b) the first or second diode (D1, D2) is in effective connection via an output-side connection terminal (5) of the protective relay contact (4') and
c) via a switching contact (6', 6") of this relay,
d) with its output coil (6).
4. Monitoring device according to Claim 3, characterized in that an extinction circuit with a series connection comprising a damping capacitor (9) and a damping resistor (8) is provided between the output-side connection terminal (5) of the protective relay contact (4') and a positive voltage terminal (1) of the tripping circuit of the circuit-breaker.
EP85104197A 1984-05-04 1985-04-06 Supervision device for the tripping circuit of an electrical power circuit breaker, and supervision method Expired EP0160235B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2177/84A CH652845A5 (en) 1984-05-04 1984-05-04 MONITORING DEVICE FOR THE TRIP CIRCUIT OF AN ELECTRICAL CIRCUIT BREAKER.
CH2177/84 1984-05-04

Publications (2)

Publication Number Publication Date
EP0160235A1 EP0160235A1 (en) 1985-11-06
EP0160235B1 true EP0160235B1 (en) 1989-11-23

Family

ID=4227689

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Application Number Title Priority Date Filing Date
EP85104197A Expired EP0160235B1 (en) 1984-05-04 1985-04-06 Supervision device for the tripping circuit of an electrical power circuit breaker, and supervision method

Country Status (5)

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US (1) US4670742A (en)
EP (1) EP0160235B1 (en)
CA (1) CA1237475A (en)
CH (1) CH652845A5 (en)
DE (1) DE3574436D1 (en)

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DE4318189A1 (en) * 1993-06-01 1994-12-08 Abb Management Ag Device and method for monitoring a switch position

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US5304958A (en) * 1992-11-20 1994-04-19 Motorola, Inc. Saw oscillator gain amplifier with auto phase shift
DE29818539U1 (en) 1998-10-09 1999-01-07 Siemens AG, 80333 München Circuit arrangement for an electrical circuit breaker
JP5243344B2 (en) * 2009-05-20 2013-07-24 三菱電機株式会社 Circuit breaker
WO2015197814A1 (en) * 2014-06-27 2015-12-30 Koninklijke Philips N.V. Power supply system and method and circuit using the same
CN113793481B (en) * 2021-08-17 2023-01-24 三一汽车制造有限公司 Emergency stop safety protection system and concrete pump truck

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US3418914A (en) * 1967-01-20 1968-12-31 Eugene F. Finkin Automobile ventilation techniques
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US2907012A (en) * 1955-12-30 1959-09-29 Pitman Duncan Sofar alarm
US3418914A (en) * 1967-01-20 1968-12-31 Eugene F. Finkin Automobile ventilation techniques
US3641552A (en) * 1970-02-18 1972-02-08 Int Assemblix Corp Centrally located access alarm system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4318189A1 (en) * 1993-06-01 1994-12-08 Abb Management Ag Device and method for monitoring a switch position

Also Published As

Publication number Publication date
DE3574436D1 (en) 1989-12-28
US4670742A (en) 1987-06-02
CH652845A5 (en) 1985-11-29
CA1237475A (en) 1988-05-31
EP0160235A1 (en) 1985-11-06

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